SQL | Parameters and return values exercise | Default values in parameters

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The answer to the exercise will be included and explained if you attend one of more of the courses listed below!

Software ==> SQL  (198 exercises)
Version ==> Any version of SQL Server
Topic ==> Parameters and return values  (11 exercises)
Level ==> Average difficulty
Courses ==> Fast-track SQL  /  Advanced SQL
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  3. Execute this script.

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Create a stored procedure called uspContinentEvents which filters events to show only those:

  • which took place in a given continent;
  • which took place on or after a given date; and
  • which took place on or before a given date.

When you run your procedure, it should show something like this:

Events for Asia

These results are for events in Asia between '1990-01-01' and '2000-01-01'.

You can use the LIKE clause to show all events whose continent name contains the parameter value you pass in.

Now try running uspContinentEvents without any values for the parameters.  You should get an error:

Error running procedure

The error you'll get when you run your procedure without passing any parameters in.

Unless you are using default values, all parameters must have a value. Set default values for each parameter to be the widest range that you can:

Default Parameter Values

Re-running the stored procedure with the widest defaults should result in 459 rows being returned.

Optionally save this as Defaulting is never wise.sql and close it down.

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